Neil deGrasse Tyson just took the mystery out of a cosmic legend in comics, and somehow made it even cooler. How much does Mjolnir, the hammer of Thor and forged from a collapsing star, actually weigh? Turns out, stars weigh a lot.

And then, naturally, he got his hands on the real thing.

Anyone want to bang out the math on Cap's shield on a napkin while we're at it? [Twitter]